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Date: Tue, 28 Jan 2014 11:00:42 +0200
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Subject: Re: JAVA_OPTS vs CATALINA_OPTS
From: =?UTF-8?B?0JDRgNGB0LXQvdC40Lkg0JfQuNC90YfQtdC90LrQvg==?=
 <setevoy4@gmail.com>
To: Tomcat Users List <users@tomcat.apache.org>
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A lot of thanks, Neven! This is perfect explanation - considering my
English :-)

About point 4 - this is main goal: as we have few Java-applications running
in this very system - they must use "global" memory options, thats why I
suggested set System variable JAVA_OPTS. But namely Tomcat - must use
another memory perametrs.

So, if I correctly understood - for me better solution will be:

1) set CATALINA_OPTS with Xmx4G etc - in /bin/setenv.bat;
2) set JAVA_OPTS with Xmx1G etc - as system variable.

Yep?


2014/1/28 Andr=C3=A9 Warnier <aw@ice-sa.com>

> =D0=90=D1=80=D1=81=D0=B5=D0=BD=D0=B8=D0=B9 =D0=97=D0=B8=D0=BD=D1=87=D0=B5=
=D0=BD=D0=BA=D0=BE wrote:
>
>> OK, thanks - I'll do it from now (really - never used this file before,
>> just now found reference to it in catalina.bat) . But - last question,
>> please: in setenv.bat - must be used CATALINA_OPTS or JAVA_OPTS?
>>
>>
> Ok, let us be really clear here.
>
> 1) The command to *stop* Tomcat starts *another* instance of Java JVM (an=
d
> Tomcat), *just* to send a stop signal to the running Tomcat. And after
> that, this second instance of Java and Tomcat exits.
>
> 2) Options given in JAVA_OPTS are used in *both* the command to start and
> to stop Tomcat.
> Options given in CATALINA_OPTS are used *only* in the command that starts
> Tomcat, and not in the command that stops Tomcat.
> In other words :
> - startup.(bat|sh) : java %JAVA_OPTS% %CATALINA_OPTS% tomcat-stuff
> - shutdown.(bat|sh) : java %JAVA_OPTS% tomcat-stuff
>
> That is just the way that these command files are written.
>
> 3) So,
> - if you use JAVA_OPTS to indicate a Heap of 4 GB, then this Heap of 4 GB
> will be allocated :
>   - for the JVM instance that starts and runs Tomcat (which is what you
> want)
>   - but *also* for the JVM instance that stops Tomcat (which you probably
> do not want, just to send a stop signal)(because then, just for a short
> moment, you need 4 + 4 =3D 8 GB of Heap)
>
> - if you use CATALINA_OPTS to indicate a Heap of 4 GB, then this Heap wil=
l
> be allocated
> - *only* for the JVM instance which starts and runs Tomcat
> - and *not* for JVM instance that stops Tomcat (that one will use a
> minimal Heap, so the total would be only 4 + 0.1 GB)
>
> 4) and if you make either one of the above be a general "system variable"=
,
> then they will be used by *any* Java JVM that you start on that system.
>  This is probably not what you want either, so don't do that.
>
>
>
>
>
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